Warm-blooded animals, also known as endothermic animals, generate their own internal body heat and maintain a constant body temperature, while cold-blooded animals, also known as ectothermic animals, rely on external sources of heat to regulate their body temperature. Warm-blooded animals have higher metabolic rates and require more energy to sustain their body temperature, while cold-blooded animals have lower metabolic rates and are more energy-efficient. Examples of warm-blooded animals include mammals and birds, while examples of cold-blooded animals include reptiles, amphibians, and fish.